Question

describe the effect of the poisonous fruit on the enemy​

Answer 1

✔However, the speaker was unable to do the same with an enemy and this leads to developing resentment and an even stronger degree of hatred. ... Eventually the anger blossoms into a poisoned fruit, the enemy eats the fruit and dies and the speaker seems to be glad of this.

Answer 2

The principal theme of "A Poison Tree" is not anger itself but how the suppression of anger leads to the cultivation of anger. Burying anger rather than exposing it and acknowledging it, according to "A Poison Tree," turns anger into a seed that will germinate.